Tina and her puppy are tugging on a rope, each pulling on opposite ends.

when is tina doing work?

a. the entire time she plays with the puppy
b. whenever she pulls the puppy toward her
c. when she holds the rope steady as the puppy pulls it
d. when she lets go of the rope and the puppy pulls it away

c.is a substance that requires a small amount of energy per gram to raise its temperature; has strong cohesive forces between molecules.

explanation:

a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)